Abstract: A computing system receives user input via a touch-interface that involves motion of one or more touches relative to the touch-interface. Responsive to the user input including two or more concurrent touches of the touch-interface involving motion in a coordinate direction, the computing system compresses graphical content within a graphical user interface in the coordinate direction toward a reference datum line. Responsive to the user input including two or more concurrent touches of the touch-interface involving motion in an opposite direction from the coordinate direction, the computing system expands graphical content within the graphical user interface in the opposite direction and away from the reference datum line.

Abstract: A computing system receives user input via a touch-interface that involves motion of one or more touches relative to the touch-interface. Responsive to the user input including two or more concurrent touches of the touch-interface involving motion in a coordinate direction, the computing system compresses graphical content within a graphical user interface in the coordinate direction toward a reference datum line. Responsive to the user input including two or more concurrent touches of the touch-interface involving motion in an opposite direction from the coordinate direction, the computing system expands graphical content within the graphical user interface in the opposite direction and away from the reference datum line.

Abstract: A computing system receives user input via a touch-interface that involves motion of one or more touches relative to the touch-interface. Responsive to the user input including two or more concurrent touches of the touch-interface involving motion in a coordinate direction, the computing system compresses graphical content within a graphical user interface in the coordinate direction toward a reference datum line. Responsive to the user input including two or more concurrent touches of the touch-interface involving motion in an opposite direction from the coordinate direction, the computing system expands graphical content within the graphical user interface in the opposite direction and away from the reference datum line.

Abstract: Acoustic sensing provides a mode by which user input is received by a computing device. As an example, a surface is acoustically monitored for interactions with one or more user-manipulated objects, such as a body part of the user or a variety of passive objects. Acoustic analysis of frequencies produced by such objects interacting with the surface enables these objects to be distinguished from each other. Multiple objects interacting with the surface at the same time may be associated with different types of user input to provide a multi-touch user interface for the computing device. The acoustic sensing techniques described herein support motion-based and tapping-based gestures using one, two, or more touch interactions with an acoustically monitored surface.

Abstract: A computing system receives user input via a touch-interface that involves motion of one or more touches relative to the touch-interface. Responsive to the user input including two or more concurrent touches of the touch-interface involving motion in a coordinate direction, the computing system compresses graphical content within a graphical user interface in the coordinate direction toward a reference datum line. Responsive to the user input including two or more concurrent touches of the touch-interface involving motion in an opposite direction from the coordinate direction, the computing system expands graphical content within the graphical user interface in the opposite direction and away from the reference datum line.

Abstract: Acoustic sensing provides a mode by which user input is received by a computing device. As an example, a surface is acoustically monitored for interactions with one or more user-manipulated objects, such as a body part of the user or a variety of passive objects. Acoustic analysis of frequencies produced by such objects interacting with the surface enables these objects to be distinguished from each other. Multiple objects interacting with the surface at the same time may be associated with different types of user input to provide a multi-touch user interface for the computing device. The acoustic sensing techniques described herein support motion-based and tapping-based gestures using one, two, or more touch interactions with an acoustically monitored surface.